Total Books Read by Students

In a recent survey, a class of students was asked to report the number of books they read in a month. The results are as follows:

• 3 students read 1 book.
• 4 students read 2 books.
• 2 students read 3 books.
• 1 student read 4 books.

Based on this data, compare the total number of books read by students.